Mixing-machine.



G. W. CLARK.

MIXING MAOHINE.

APPLICATION FILED-JAN. 4. 1909.

937,359,, Patented Oct. 19, 1909 2 SHEETS-SHEET 1 G. W. CLARK.

MIXING MACHINE.

APPLICATION FILED JANA. 1909.

937,359. Patented Oct. 19, 1909.

2 SHEETS-SHEET 2' v & Omar/A mac UNITED sTArEs H STER W- 44 3 Q MISHA A A I DIANA- MIXING-MAGHINE.

Specification of Letters Patent.

Paten d Ge 19, race.

appl i n fl u y 4, iaea a e; in, name.

chines, of which the following is a specifi cation.

This invention relates to concrete mixing machines. o

One object of the invention is to provide a machine for mixing cement-itious material embodying such characteristics that the mixing drum may be operated with'very little power.

Another object of the invention resides in the provision of a concrete mixing machine whose mixing drum is mounted upon a shaft confined wholly within the drum, whereby unnecessary obstructions at the feeding and discharge ends of the drum are obviated and whereby the frictional resistance incident to the rotation of the drum is reduced to a minimum. 7

With the above' and other objects in view, the Present invention consists in the combination and arrangements of parts hereinaf- -.ter.more fully described, illustrated in the accompanying drawmgs, and particularly dinal sectional view on the line 00-11: of Fig.

3. Fig. 3 is a top plan view. Fig. 4 is a longitudinal sectional view through the hub and spokes upon which the drum is mounted. Fig. 5 is a transverse sectional view on the line yy of Fig. 4.

Referrin now more particularly to the accom anying drawings, thereference character indicates oppositely disposed standards which may be of any desired formation, but which as shown include the downwardly diverging legs 1 and 2 having their feet 3 secured to suitable blocks 4 by means of suitable fastenings 5.

J ournaled 1n the upper ends of the'legs A are stud shafts 6 and 7 upon the inner ends of which are mounted diverging arms 8 and 9 of a reach or yoke 10. The shaft 6 is preferably longer than the shaft 7 and is provided at its outer end with a gear or other (lrlvlng'element 11, and at its inner endhaving a pinion 12 designed to mesh with the rack 13 secured in any suitabie manner to the drum 14 for the purpose of rotating the latter when the stud shaft 6 is rotated through the driving element 11.

The drum 14; has tapering ends provided with feed and discharge openings 15 and 16, respectively, and in order to properly support the drum 141 to permit of its rotative movement, and also of a tilting movement at or during the rotation thereof, as is common in machines of this character, I provide the yoke 10 with an inwardly and downwardly projecting arm 17 which projects through the feed opening 15 and whose inner end-is directed substantially horizontal to the longitudinal axis of the mixing drum,

as indicated at 18, and provided with a bore 19 to receive one end of the shaft 20. which drum, but terminates short thereof and at 1 its latter end has keyed'thereto a disk 21.

Mounted upon the shaft 20 is a wheei whose rim 22 18 secured in any suitable manner to the inner surface of the mixing drum and Whose s .okes 23 converge toward the hub 24, the ore of which is prefer-ably of a diameter somewhat greater than the diameter of the shaft 20, so that I may interpose between the shaft 20 and the hub 24 the sets of bearing rollers 25 and 26, which latter are held in spaced relation by a loosely mounted collar 27 there being caps 28 and 29 embracing the ends of the hub, the cap 29 also embracing the aforesaid disk 21, and by virtue of the fact that the disk 21- is keyed at 31 to the shaft 20, the hub is prevented from shifting in either direction on the shaft.

The character 32 indicates a stufiing box cooperating with the cap 28, and if desired, I may provide the hub 24 with an opening to receive the reduced end 33 of an oil cup 3 1, for the purposes well known.

It will thus be seen that the shaft. upon which the drum is rotatably mounted is confined wholly within the drum and that incident to its short length and its peculiar mounting, the frictional resistance usually offered drums in the present art, is reduced to a minimum if not practically obviated.

Secured upon one of the standards A is a fulcrum arm 35, to which arm is pivoted at 36 an operating lever 37, whose lower end is pivoted to one end of a link 38, which latter has its freeend pivoted at 39 to the arm 9 of the yoke 10. By operating the lever 37, in either direction, the drum may be tilted to various positions, as indicated in dotted lines in Fig. 1, during rotation thereof, as is customary in machines of this character, that is in simultaneously mixing and discharging the material from the drum. By reason of the lever 37 being secured to the yoke 10 and the latter having the arm 17 in which one end of the shaft 20 is mounted, the yoke, drum, and the axis of the latter are all moved together, so that there is atyoke 10 and its arms 8 and 9 may be formed angle-like, as shown, and provided with the reinforcing webs 4:0, as shown in Fig. 1, although, obviously, the formation of these particular arms isimmaterial to the operation of my invention.

What is claimed is 1.. I11 a concrete mixer, standards, a yoke including arms pivotally secured to said standards, said yoke having an inwardly projecting arm, a shaft mounted in said arm, a mixing drum into one end of which projects said arm, a hub mounted upon said shaft and having spokes radiating toward the inner surface of the drum and secured to the latter, a rack upon the outer surface of the drum, a pinion meshing with said rack, means for driving said pinion to rotate the drum, and an operating lever having connection with said yoke whereby the drum may be tilted.

2. In a mixing machine, a drum, a shaft upon which the drum is rotatably mounted,

means for supporting the shaft, the ends of said shaft terminating short of the ends of the drum, means for rotating the drum, and means for tilting the same.

3. In a concrete mixer, a drum, a shaft confined wholly within the drum and upon which the latter is rotatably mounted, means whereby the drum may be rotated, and a le ver constructed and arranged to tilt the drum during rotation of the latter.

4'. In a concrete mixer, standards, stud shafts mounted in the upper ends of the standards, a yoke including diverging arms connected to said stud shafts, a drum, a rack on the drum, a pinion mounted upon one end of one of said stud shafts for mesh with said rack, means on said latter stud shaft whereby the pinion may be driven, said yoke having an arm projecting into one end of the drum, a shaft mounted at one end of said arm, and means between the shaft and the inner surface ofthe drum for sup porting the latter.

5. In a concrete mixing machine, a drum, a member embracing one end of the drmn, means for pivotally mounting said member, said member having an arm projecting into the drum, connections between said arms and the interior of the drum to support the latter, means to rotate the drum, and means for tilting the latter.

6. In a concrete mixing machine, a drum, a member embracing one end of the drum, means for pivotally mounting said member, said member having an arm projecting into the drum, connections between said arm and the interior of the drum to support the latter, means to rotate the drum, a hopper comn'mnicating,with one end of the drum, and a lever for tilting the drum during rotation of the latter.

7. In a concrete mixer, a drum, a shaft confined wholly within the drum, means for supporting the shaft, a hub on the shaft and having spokes radiating from the hub and secured to the inner surface of the drum,

, ter, the shaft and said connections being confined within the drum, means for rotating the drum, and means for tilting the drum.

In testimony whereof I afiix my signature, in presence of two witnesses.

CHESTER W. CLARK.

Witnesses LULU DJVVA HLEN, Gnome Orxrscn. 

